[ATTACH]75643[/ATTACH] [ATTACH]75644[/ATTACH] trying to figure out if i can change the plumbing layout from my old tub to a center drain on shower on a 30x60 floor layout. after much DiY video viewing it looks like i would need to lower the drain under the plywood and extend in to the center of the shower. my concerns are: 1. will dropping the horizontal drain down below the plywood have any negative affect on the way it attaches back to P-trap. (not sure how much drop you need before it hits the trap) 2. i would need to drill 2 holes in the 2x12 ( 2 red lines on image) to get the pipe to the center position and would need to rip up the floor to do that. is this option a doable one?

So I've installed a new corner shower in my small front bath. Everything was going great, floor was level, I've had NO issues during the install of the shower itself. I've stepped in and out of this thing 20 times during this install. The floor was perfectly level in all directions when I started. All that was left was to caulk the seams of the corner cubby and as I step I Tom the shower itself, I felt the floor move. I step back out and in and now, after I'm all done, the front 1/3 of the plastic Maxx brand shower rises and lowers when you step into it. Fudge! I was going to caulk along the edge where the pans meets the tile but it'll just tear off as the flex s too much and you hear and feel a sound as the pan hits the subfloors when you step I to the shower. Putting aside how unbelievably frustrating this is to have this show up when I'm basically done, how can I fix this? I do have access to the underside of the shower and was contemplating drilling some small pilot holes and putting liquid nails up under the pan but it's a grid pattern so there's not much to bite into with that method. Any feedback is appreciated.